Added some comments
Added some comments

shaunstanislaus/XLParser,millergarym/XLParser,millergarym/XLParser,Jobava/XLParser,SSNico/XLParser,SSNico/XLParser,shaunstanislaus/XLParser,millergarym/XLParser,shaunstanislaus/XLParser,kouweizhong/XLParser,kouweizhong/XLParser,PerfectXL/XLParser,PerfectXL/XLParser,Jobava/XLParser,SSNico/XLParser,PerfectXL/XLParser,Jobava/XLParser,kouweizhong/XLParser